Comparing the Impacts of Drought

Why development changes the impacts of drought

Drought is a prolonged period of unusually low rainfall that leads to water shortages. Its impacts depend not just on how little rain falls, but also on how people obtain water, earn a living and buy food. Vulnerability means how susceptible people or places are to harm from a hazard.

A household whose crops provide both its food and income can lose both when rain fails. A household with income from work outside agriculture may still face higher food prices, but is less directly dependent on its own harvest. Development therefore influences the consequences of drought, although it does not protect everyone equally.

The two examples here are California, within the developed USA, and Ethiopia, an emerging/developing country in the Horn of Africa. California experienced a major drought during 2011–2017. Ethiopia experienced severe drought during 2014–2016, with the 2015 drought particularly severe.

California: losses in a wealthy, water-dependent economy

California has a large agricultural industry producing fruit, vegetables and nuts. Many crops depend on irrigation: supplying water to crops rather than relying only on rainfall. This makes falling water supplies an economic problem even in a developed country.

During the drought, farmers could not grow crops on thousands of acres. Reduced production affected farm incomes and employment, with 17,100 agricultural workers losing their jobs. Food prices increased by 6%, showing that the impacts reached consumers as well as farmers. These effects are connected: water shortages reduce production, which reduces demand for workers and can increase prices when food supplies fall.

There were also direct social impacts. Falling groundwater levels contributed to subsidence, where the ground settles to a lower level, damaging properties. Some people paid private companies to drill wells. Wildfires destroyed homes, leaving people homeless, while rebuilding costs and expensive insurance made recovery difficult. California’s wealth therefore did not prevent serious losses, particularly for farm workers and affected households.

Ethiopia: farming losses become a food-security crisis

Around 85% of Ethiopia’s population lived in rural areas in this case-study context, with livelihoods heavily dependent on agriculture, rainfall and traditional farming technologies. There were insufficient wells to provide irrigation when the rains failed. This made many households particularly exposed to drought.

Crop failure and livestock deaths reduced both food supplies and income. Livestock losses reached 40–60% in some areas, reducing milk production as well as the animals available to sell. Hunger and malnutrition made people more vulnerable to disease.

The economic effects reinforced the social impacts. Cereal prices rose while livestock prices and wages fell. Purchasing power is the amount that someone’s income can buy: it falls when income decreases or prices increase. For an Ethiopian farming household, drought could therefore mean less food produced at home, less income from livestock and more expensive food to buy.

Water collection also disrupted everyday life. Many women and children walked up to 20 km to collect water, leaving less time for farming and school. Some people migrated from rural to urban areas as their livelihoods became harder to maintain.

Ecosystems suffer in both places

An ecosystem consists of living organisms interacting with one another and their non-living environment. Drought affects ecosystems because plants and animals need water, and changes to one part of the system affect others.

In California, drying rivers prevented fish such as salmon from reaching their breeding grounds. Wetlands were drained to secure water supplies, changing habitats and reducing fish populations. Dry vegetation also allowed wildfires to spread rapidly, destroying habitats and killing wildlife. These examples show both the direct effects of water shortage and additional damage caused by people trying to obtain water.

In Ethiopia, reduced water and food supplies increased disease among wildlife. Dry vegetation increased wildfire damage to habitats. Overgrazing and over-cultivation of drought-prone land contributed to desertification: land degradation in dry regions that reduces the land’s ability to support vegetation and farming. Drought and pressure from land use can therefore reinforce one another rather than acting separately.

Making a balanced comparison

Both places experienced agricultural losses, pressure on household finances and ecosystem damage. The important difference is how these impacts translated into people’s lives. In California, major consequences included lost employment, higher food prices and property damage. In Ethiopia, dependence on rain-fed farming meant that crop and livestock losses directly threatened food supplies, health and household survival.

This does not mean that every Californian was secure or that everyone in Ethiopia was affected equally. Development helps explain vulnerability, but occupation, access to water and the location of a household also matter. Nor does a country’s wealth shield its ecosystems from drying rivers, habitat loss or wildfire.

Using socio-economic data to assess impacts

Socio-economic data describe social and economic conditions. To interpret a table, first read its headings, units, dates and geographical coverage. Then identify a pattern, select evidence and explain what it means for people.

The following table brings together selected indicators from the two drought case studies. The indicators measure different things, so they are evidence of different impacts—not a single numerical ranking of severity.

For example, the Ethiopian livestock figure shows substantial losses in affected areas, but it is not a national average. The water-collection figure describes journeys up to 20 km; it does not mean everyone travelled that distance. California’s employment figure counts workers, whereas its food-price figure measures a percentage increase.

A useful interpretation links evidence to a consequence: Ethiopia’s livestock losses reduced milk supplies and assets that households could sell, increasing vulnerability to hunger. California’s job-loss figure instead supports an explanation about reduced earnings in agricultural communities.

For a stronger comparison, look for matching indicators covering similar periods and areas—for example, changes in household income in both places. Absolute financial losses alone cannot establish which population suffered more severely. Combine economic indicators with evidence about food security, health and access to water.